<template>
   <button @click="modalOpen=true">打开一个对话框</button>
   <!-- 对话框代码   -->
   <Teleport to="body">
      <div v-if="modalOpen" class="modal">
         <div>这是对话框</div>
         <button @click="modalOpen=false">关闭对话框</button>
      </div>
   </Teleport>
</template>

<script lang="ts">
    import {defineComponent,ref} from 'vue'
    export default defineComponent({
        name: "ModalButton",
        setup() {
            const modalOpen = ref(false)
            return {
               modalOpen
            }
        }
    })
</script>

<style scoped>
   .modal {
      position: absolute;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
      background-color: rgba(0, 0, 0, 0.5);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
   }

   .modal div {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      background-color: white;
      width: 300px;
      height: 300px;
      padding: 5px;
   }
</style>